On the day of the killing, Mr Safi and Fatima Khan had gone to a Costa Coffee near to her work at Vigilant Security in North Acton.

The couple were hanging around benches outside the coffee shop, before Raza Khan arrived in a minicab.

A witness noted that it was obvious the couple were together but there was a "weird atmosphere" between them, jurors heard.

When Raza Khan arrived, he went straight up to them holding a large knife in his hand, jurors heard.

Ms Bex said: "Raza Khan spoke briefly to either the defendant or Khalid Safi and then turned to face him at which point the prosecution suggest the knife would have been in plain view.

"Mr Safi produced a screwdriver and they began to fight. The fight lasted 15 seconds at most and it is caught on CCTV. Mr Safi died at the scene having received a number of wounds to his chest, one penetrating his heart."